HarmonyOS 鸿蒙Next EmitterData我在接收端如何解析？

@ohos.events.emitter (Emitter)-进程线程通信-ArkTS API-Basic Services Kit（基础服务）-基础功能-系统 - 华为HarmonyOS开发者

和如下demo获取到eventdata中的数据

import emitter from '@ohos.events.emitter'
function registerEvent() {
// 定义一个eventId为1的事件 
let event: emitter.InnerEvent = { eventId: 1 };
// 收到eventId为1的事件后执行该回调 
let callback = (eventData: emitter.EventData) => {
let content: emitter.EventData = eventData[“content”]
let id: emitter.EventData = eventData[“id”]
let isEmpty: emitter.EventData = eventData[“isEmpty”]
console.info(‘event callback content=’ + content);
};
// 订阅eventId为1的事件 
emitter.on(event, callback);
}
function sendEvent() {
// 定义一个eventId为1的事件，事件优先级为Low 
let event: emitter.InnerEvent = { eventId: 1, priority: emitter.EventPriority.LOW };
let data = new Map<string, Object>();
data.set(“content”, “c”);
data.set(“id”, 1);
data.set(“isEmpty”, false);
let eventData: emitter.EventData = {
data
};
// 发送eventId为1的事件，事件内容为eventData 
emitter.emit(event, eventData);
}
@Entry
@Component
struct Index {
@State message: string = ‘Hello World’
build() {
Row() {
Column() {
Text(“发送”).fontSize(50).fontWeight(FontWeight.Bold).onClick(() => {
sendEvent();
})
Text(“注册”).fontSize(50).fontWeight(FontWeight.Bold).onClick(() => {
registerEvent();
})
}.width(‘100%’)
}.height(‘100%’)
}
}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

参考如下demo，可获取boolean类型的数值：

import emitter from ‘@ohos.events.emitter’

function registerEvent() { // 定义一个eventId为1的事件
let event: emitter.InnerEvent = { eventId: 1 };
// 收到eventId为1的事件后执行该回调
let callback = (eventData: emitter.EventData) => {
<span class="hljs-keyword">let</span> res = eventData.data

<span class="hljs-keyword">let</span> content: string = res?.content

<span class="hljs-keyword">let</span> id: number = res?.id

<span class="hljs-keyword">let</span> isEmpty: boolean = res?.isEmpty

console.info(<span class="hljs-string">'event callback content='</span> + <span class="hljs-built_in">JSON</span>.stringify(eventData))

console.info(<span class="hljs-string">'isEmpty'</span> + isEmpty + <span class="hljs-string">'typeof isEmpty'</span> + <span class="hljs-keyword">typeof</span> isEmpty)

isEmpty
};
// 订阅eventId为1的事件
emitter.on(event, callback);
}
function sendEvent() { // 定义一个eventId为1的事件，事件优先级为Low
let event: emitter.InnerEvent = { eventId: 1, priority: emitter.EventPriority.LOW };
let eventData: emitter.EventData = {
data: {

  content: <span class="hljs-string">'c'</span>,

  id: <span class="hljs-number">1</span>,

  isEmpty: <span class="hljs-literal">false</span>

}
};
// 发送eventId为1的事件，事件内容为eventData
emitter.emit(event, eventData);
}
@Entry
@Component
struct Index {
@State message: string = ‘Hello World’
build() {
Row() {

  Column() {

    Text(<span class="hljs-string">"发送"</span>)

      .fontSize(<span class="hljs-number">50</span>)

      .fontWeight(FontWeight.Bold)

      .onClick(() =&gt; {
        sendEvent();
      })

    Text(<span class="hljs-string">"注册"</span>)

      .fontSize(<span class="hljs-number">50</span>)

      .fontWeight(FontWeight.Bold)

      .onClick(() =&gt; {
        registerEvent();
      })
  }

  .width(<span class="hljs-string">'100%'</span>)
}

.height(<span class="hljs-string">'100%'</span>)
}
}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>